Elliott would have been 85 at the time of the film's production.
I think the moment where Stanforth/Brody resigns would have had a bit more weight, though, on the other hand, the character would be at an age where such a gesture might not seem that meaningful.
Maybe we'd have been freed of the notion that Marcus would be a Dean of Students, which seems somewhat improbable, and remote from the museum duties and pursuits that had otherwise been his life's work?